Lemon chess pie comes together with just a few pantry and refrigerator staples. Begin with a homemade pie crust or store-bought crust. To make the filling, you will need unsalted butter, fresh lemons, eggs, granulated sugar, all-purpose flour, finely ground cornmeal, and kosher salt. If you want to make this pie gluten-free, buy a gluten-free pie crust or make your own, and replace the flour with cornstarch.